The consistency of a highway alignment refers to the conformity of its geometry to driver expectancy and to the improvement of the design consistency and consequently it is necessary to know real speed behavior in order to calculate highway safety. The disparity between design and operating speeds has been shown, in fact several different studies were undertaken to predict the operating speed in different conditions as a function of the alignment features: horizontal and vertical curves, combinations of tangent sections of horizontal and vertical curves; sections prior to or following horizontal curves. In literature however, no studies speak of the operating speed on hairpin curves of mountain roads where driver behavior is influenced by the combination of small radius curves, limited sight distance and the approach to the slope of a tangent. Therefore, a mathematical model was developed specifically for mountain roads using speed data collected on hairpin curve and tangent approaches. The experimental study was carried out using traffic counters capable of recording the following variables during the passage of each vehicle in both directions: vehicle length, instant speed and direction. Video cameras were also used. In this paper the author also investigated the real speed driver behavior by analyzing deceleration and acceleration rates. These rates were calculated for each vehicle and then the 85th percentile of the rate distribution was also calculated. With the availability of acceleration and deceleration rates that respect real driver behavior, it is possible to analyze the defects of existing mountain roads and to evaluate corrective measures that can be implemented.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Experimental Analysis on Hairpin Curves



    Erscheinungsdatum :

    2010-09-27


    Anmerkungen:

    doi:10.3846/bjrbe.2010.21
    The Baltic Journal of Road and Bridge Engineering; Vol 5, No 3 (2010): The Baltic Journal of Road and Bridge Engineering; 148-155 ; 1822-4288 ; 1822-427X



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :

    DDC:    629



    Experimental study on driver’s mental load in hairpin curves of mountainous highway

    Ying Chen / Xiaohui Wang / Xiaobo Zhang et al. | DOAJ | 2023

    Freier Zugriff


    Track Behavior and Crash Risk Analysis of Passenger Cars on Hairpin Curves of Two-Lane Mountain Roads

    Zhigang Yu / Ying Chen / Xiaobo Zhang et al. | DOAJ | 2021

    Freier Zugriff

    Produktionsprozess eines Hairpin-Stators

    Kampker, Achim / Heimes, Heiner Hans / Kawollek, Sebastian et al. | TIBKAT | 2020